Consolidated Statements of Earnings - Unaudited - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Income Statement [Abstract]
Net sales	$ 100,154	$ 96,705
Cost of goods sold	65,930	63,237
Gross Margin	34,224	33,468
Selling, general and administrative expenses	15,246	14,872
Research and development expenses	6,003	6,163
Restructuring and impairment charges	777	0
Gain (Loss) on Disposition of Property Plant Equipment	(2)	3
Operating earnings	12,196	12,436
Other income (expense):
Interest expense	(684)	(820)
Interest income	253	547
Other income (expense)	460	(198)
Total other income (expense)	29	(471)
Earnings before income taxes	12,225	11,965
Income tax expense	3,741	4,102
Net earnings	$ 8,484	$ 7,863
Earnings per share:
Basic (in dollars per share)	$ 0.00	$ 0.00
Diluted (in dollars per share)	$ 0.00	$ 0.00
Basic weighted - average common shares outstanding (in shares):	32,802	32,632
Effect of dilutive securities (in shares)	560	373
Diluted weighted - average common shares outstanding (in shares)	33,362	33,005
Cash dividends declared per share (in dollars per share)	$ 0.04	$ 0.04